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Right to Use Assets and Leases payable - Summary of Amortization Expenses in the Financial Statements (Detail) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Expenses by nature [abstract]
Inventories and cost of products and services sold	R$ 66,604	R$ 48,134	R$ 15,044
Selling and marketing	257,846	244,974	8,920
General and administrative	3,872	6,950	75,370
Amortization expense	R$ 182,681	R$ 120,492	R$ 99,334

X

- Definition

The amount of amortisation expense. Amortisation is the systematic allocation of depreciable amounts of intangible assets over their useful lives.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 112
-Subparagraph c
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-URIDate 2019-03-27

+ Details

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Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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X

- Definition

The amount of amortization expense recognized as General and administrative.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

The amount of amortization expense recognized as Inventories and cost of products and services sold.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

The amount of amortization expense recognized as Selling and marketing.

+ References

No definition available.

+ Details

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Namespace Prefix:	ugp_
Data Type:	xbrli:monetaryItemType
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